Sectional tubular boiler



(No Model.) 3 Sheets-Sheet 1.

G. T. PILLINGS.

SEGTIONAL TUBULAR BOILER.

No. 276,873. Patented May 1,1883.

3 Shepts-Shet 2.

R. nted May 1,1883.-

G. .T. PILLINGS.

(No Model.)

SEGTIONAL TUBULAR BOILE No. 276,873. -Pate @QfJM/Z INVENT IR- GuTQPILLINGS; 'SEGTIONAL TUBULAR BOILER.

NQ.2V76,873. v PatentedMay 1,1883.

3 Sheets-Sheet 3.

QM @142 '%w MM UNITED STATES PATENT OFFICE.

GEORGET. PILLINGS, or BALTIMORE, MARYLAND.

SECTIONAL TUBULAR BOILER.

SPECIFICATION forming part of Letters Patent No. 276,873, dated May 1, 1883.

Application filed February 23,1883. (No model.)

To all whom it may concern:

Be it known that I, GEORGE T. PILLINGs, of,

the city of Baltimore and State of Maryland, have invented certain Improvements in a Seetional Tubular Boiler, of which the following is a specification. y This invention relates to certain improvements in the construction of a sectional water tubular boiler, as hereinafter fully described. In the accompanying drawings forming a part hereof, Figure I is a longitudinal section of the improved boiler. Fig. [I is a transverse section 9f the same, taken on the dotted line was, Fig. I. Figs. III and IV are views of parts of the invention on an enlarged scale.

Similar letters of reference indicate similar parts in all the views. l

A A are heaters, which consist of hollow castings of iron or steel, preferably of circular cross-section, and arched or curved longitudinally, as shown particularly in Fig. II. The heaters are provided with nozzles a, into which the lower ends,of the vertical water-tubes b are screwed,.and at their ends have transverse openings 0, surrounded by flanges d. On one side of the heaters the flanges d are tongued, and at the other side grooved, which admits of a series of them being firmly held together by bolts 0 and capsf. These heaters are connected to horizontal pipes A, which extend longitudinally of the series of heaters, by pipes A, which in diameter are about equal to the width of two of the tubes 1) and intervening space, as will be seen by referring to Fig. III. The upper end of the vertical tubes 1) are united by tongued and grooved couplings B, which are held together by a bolt, 9, and caps H, in a similar manner to the heaters A. I prefer to construct the boiler in two or more main sections, each section consisting of an aggregation of vertical water-tubes with heaters and couplings, as described, the said main sections being united by offset pipes 0, constructed to answer the purpose of capsf, and

to give an increased length of water-tube, as shown in Fig. I. Byythis means mud or sediment is carriet'i backirom the first main section, under which fire is applied, to the rear ones,.and thence to a mud-drum, D, by means of a pipe, E. i

The whole apparatus as described is inclosed in walls F and slabs of fire-brick Gr, supported by bars, and the upper end of the water-tubes are united to drums or steam-receptacles H, which may be of any suitable form. 7 The boiler is provided with grate-bars and furnace and other doors, and a bridge-wall, which require no description herein.

It will be understood that the heaters cannot be burned from accumulated mud,as their arched construction tends to conduct sediment to their ends,whence it passes to the rear end of the boiler, which is thelovrest point thereof, and connected to the mud-dru'm.

The water-line is indicated by thedottcdline 3 y, Fig. 11;

Circulation of water in the boiler is elfected by heat being applied directly under the tubes 1), which causes the Water therein to rise, the downward cnrrentbeing through the pipes A,

which are of larger area and somewhat protected from the fire by the walls F. (See Fig. II.) It will be seen that steam is taken from the upper end of all the vertical pipes and tubes. Consequently there is no tendency to the lifting of water or priming.

I claim as myinvention- 1. In a sectional water tubular boiler, a series of arched heaters connected by vertical pipes to overhead horizontal pipes, which latter extend longitudinally of the said series of heaters, and a system of tubes of less cross area thauthe said pipes, secured at their lower end to the said heaters and at their upper end united by couplings, the whole being in communication with asteam-drum through the medium of pipes leading from the said couplings or their connections, substantially as specified.

2. A sectional water tubular boiler con structed in sections, each one of which consists of heaters and vertical pipes and tubes connected at their upper end, as described, the said sections being united at their lower end by ofl'set pipes to give ditierent lengths of water-tubes, substantially as and for the purpose specified. V

, GEORGE T. PILLINGS. Witnesses:

EDWARD J. DIGGS, JOHN WILLIAMS. 

